194 BYZANTINE CHURCHES CHAP. X apseSj much altered by repairs^ project boldly^ all of them showing three sides on the exterior. The roof and the cornice are Turkish3 and the modern wooden narthex has probably replaced a Byzantine narthex. On the opposite side of the street lies a cruciform font that belonged to the baptistery of the church. A RDNT IN THE. ROAD TO THE WWT Of 5-5- PETER AMD f T T r r r 5'5AVIOUR IN THE CHORA A WINDOW ON THt SOUTH /> - \ SIDE OF THt SIDE CHAPŁt/ \ BELOW THE DOME. FIG. 63. From a church of this type to the later four-columned plan is but a step. The dome piers of SS. Peter and Mark are still L-shaped, and form the internal angles of the cross. As the arches between such piers and the external walls increased in sizes the piers became smaller, until eventually they were reduced to the typical four columns of the late churches.